the sea sponges that belong to phylum porifera often grow to fit the shape of the space in which they live. this growth behavior is consistent with their asymmetric body plans, but it is hardly unique to sea sponges as lots of other animals grow to fit the shapes of their habitats. aside from their asymmetry, which of the following items is/are characteristics that are unique to sea sponges that can aide biologists in their identification? group of answer choices tentacles polyps osculum spongin spicules choanocytes cnidocytes